The Austin–Round Rock–San Marcos metropolitan statistical area, or Greater Austin, is a five-county metropolitan area in the U.S. state of Texas, as defined by the Office of Management and Budget. The metropolitan area is situated in Central Texas on the western edge of the American South and on the eastern edge of the American Southwest, and borders Greater San Antonio to the south. It forms part of the larger San Antonio-Austin Metroplex.
As of the 2020 U.S. census, the Austin–Round Rock–San Marcos MSA is the 26th-largest metropolitan area in the United States, with a total population of 2,352,426. The metropolitan area contains the city of Austin—the fourth-largest city in Texas and the 10th-largest city in the United States with a population of 974,447 people. Austin's largest suburbs are Round Rock, Cedar Park, Georgetown, San Marcos, Leander, and Pflugerville.